Heavy black smoke flows from a stack Tuesday at PBF Energy's Delaware City Refinery, which reported 'operational issues' with a unit linked to a 'coker' that extracts products from refinery leftovers.

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Trouble in a major Delaware City Refinery unit sent dark smoke billowing from a stack at the plant early Tuesday, triggering complaints from nearby residents and forcing the plant to start a backup pollution control system.

A Department of Natural Resources and Environmental Control alert said the problem involved a combined energy-recovery and pollution-control system linked to PBF Energy's petroleum "coker," a unit that extracts products from heavy, high-sulfur leftovers emerging from processes in other parts of the complex.